<template>
    <div>
        <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 试图容器 -->
    <el-card>
         <!--1. 为 ECharts 准备一个具备大小（宽高）的 DOM -->
    <div id="main" style="width: 750px;height:400px;"></div>
    </el-card>
    </div>
</template>
<script>
//1. 导入echarts 包
    import * as echarts from 'echarts';
    //导包
    import _ from 'lodash' 

export default {
    data() {
        return {
             //需要跟请求的折线图数据合并的options
             options: {
        title: {
          text: '用户来源'
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross',
            label: {
              backgroundColor: '#E9EEF3'
            }
          }
        },
        grid: {
          left: '3%',
          right: '4%',
          bottom: '3%',
          containLabel: true
        },
        xAxis: [
          {
            boundaryGap: false
          }
        ],
        yAxis: [
          {
            type: 'value'
          }
        ]
      }
        }
    },
   async mounted(){
         //3. 基于准备好的dom，初始化echarts实例
        var myChart = echarts.init(document.getElementById('main'));

            const { data:res} = await this.$http.get('reports/type/1')
            if(res.meta.status !==200){
                return this.$message.error('获取折线图失败')
            }
            // console.log(res);
         //4. 指定图表的配置项和数据 把获取到的数据用下划线lodash和options一起合并 合并完展示 到页面上
         const result = _.merge(res.data,this.options)
         
         console.log(result);
       

         //5. 使用刚指定的配置项和数据显示图表。
        myChart.setOption(result);


    },
    methods: {
        
    },
}
</script>
<style lang="less" scoped>

</style>